winswitch: session activity in menu

Description

small nitpick: winswitch + xpra active on both sides
killing winswitch on server, choosing "connect" in applet
says for the (still active) xpra "resume" in the menu, not "detach"
ie. winswitch doesn't see that this session is still connected

after resuming the xpra session I now have "connect" for the host, "detach" for the session, and the winswitch configure window "servers" says server not connected, too.